"MIDI Drum Theme" [mp3 removed -- this track is now on Bandcamp]
A commercial MIDI drum pattern was used to generate a bassline on the modular synth (sine wave). Then the same pattern (and a related one) were used to trigger General MIDI-esque drums from a couple of kits. The bass and drums were overtracked; then modest "lead" lines were added on the synth (triangle wave).